Derrigk-fork attachment



2 Sheets-Sheet 1.

(No Model.)

J. S. SCOTT.

DERRICK PORK ATTACHMENT.

No. 461,987. Patented O0t.27, 1891.

m: moms warms co., PHOTOLIYNQ, WASHINGTON. o c.

2 Sheets-Sheet 2.

(No Model.)

J. s. SCOTT. V DERRICK FORK ATTACHMENT.

No. 461,987. Patented OotQZ'i, 1891. r

X Mm

UNITE STATES PATENT OFFICE.

JASPER s. sooTT, or SAN JOSE, CALIFORNIA.

DERRICK-FORK ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 461,987, dated October27, 1891.- Application filed March 30,1891. Serial No.3$7,031. cumodel.)

To all whom it may concern:

Be it known that I, JASPER S. SCOTT, a citizen of the United States,residing at San Jos, Santa Clara county, State of California, haveinvented an Improvement in Derrick-Fork Attachments; and I herebydeclare the following to be a full, clear, and exact description of thesame.

My invention relates to an attachment for that class of implements knownas derrickforks, and its object is to provide a convenient means fortransporting straw from the stack to a point Where it is to be deliveredto the thrashing-machine or other place of deposit.

It consists in certain details of construe tion, which will be morefully explained by reference to the accompanying drawings, in whichFigure 1 is a general view of my device. Fig. 2 is a detail view of thetraveler and its connections. Fig. 3 is an enlarged sectional View ofthe latch H, showing its connections.

A is the derrick or frame-work, which may be a tripod of stout poles ofsufficient elevation, as in the -present case, or of any otherconvenient or well-known form. In the upper part of the derrick issuspended the pulley B, over which passes the rope 0, one end of whichconnects with the derrick-fork, and

the other leads down to the ground or to a point where horse or otherpower may be applied to it.

The derrick-fork D is of any usual or suitable construction, and itsyoke or frame G is suspended by a link E from thecasing F. The rope O issecured to the upper end of this casing, and by this means the fork issuspended.

II is the latch by which the fork is held in the exterior suspended yokeor frame G, and I is the cord by which this latch is pulled so as todisengage it and allow the fork to turn and discharge its load. The ropeI is connected with a second rope J, and the two unite in a common ropeor cord K, which extends down to a point within easy reach of theoperator. The ropeJ is connected with a rod L, which slides in the frontpart of the casing F and which is acted upon by a spiral spring, whichforces it up. Upon the upper end of this rod is a latch M. This latchengages one end of a bell-crank lever N, which is fulcru med in theupper part of the casing, as shown. A spring acts against the short armof the lever, pressing it against the latch M whenthe latter is inposition; but as soon as the latch M is withdrawn, by pulling upon thecord K the spring acts to throw the latch N up into the position shownin the dotted lines.

P P are two pulleys or sheaves mounted in a suitably-constructed block.The upper pulley acts as a traveler and runs upon the rope or guide Q.This rope has the upper end strongly attached to the upper part of thederrick, and it extends diagonally downward above the top of the stackfrom which the straw is to be taken, and its lower end is fixed to theground in any suitable manner. In the present case I have shown thisrope wound upon a drum R, which is journaled in a suitable frame S andhas a crank T, by which it may be turned to draw the rope as tight asmay be desired.

U is a ratchet-wheel upon the drum-shaft and it is engaged by a pawl, sothatit will be held at any point.

V is an anchor-stake, which is driven into the ground at the properpoint to make the connection with the winding-drum,previously described.Upon this stake is fitted a yoke or sleeve WV, having a stoutarmXprojecting from one side and provided with a hook, and this hooktakes hold of the loop Y of the frame S, before described.

By reason of the rigid connection of the yoke or sleeve NV and bar Xwith the stake V it will be manifest thatthe upward pull eX- erted uponthe hook when the proper tension is brought upon the rope Q will act tohold the stake Vin a vertical position insteadof pulling it over to oneside, and it thus serves to anchor the parts firmly in place, with noclan-- The rope O,which connects with the casing I which carries thepulleys P and P is a ring a, through which the rope passes as it leadsupward from the derrick-fork and the suspending casing F. The object ofthis ring is to form a connection with the derrickfork after the loadhas been discharged,so as to hold it up until it shall have traveleddown the inclined rope Q to a point above the stack,

desired to drop the load.

after which it is released from this ring and allowed to drop directlyupon the stack, as will be hereinafter described. If it were not forsome device of this sort, it would be manifest that as soon as thehoisting-rope G was relieved of the tension the fork would simply belowered at the point above which it was at that time suspended, while bymeans of this device it is prevented from being lowered until it reachesthe point where it is desired to lower it upon the stack. This iseffected as follows: a 1 1 The fork is fixed into the stack, and whenthe draft or tension is put upon the rope Cit draws the fork and itsload up until the projecting arm N strikes against the bottom of thering a. Atthe same-time the traveler or supporting-pulley P moves up theinclined rope Q until it reaches the point where it is The fork istripped and the load released by pulling upon the rope K, which actsthrough the rope I to trip the fork and allow its load to discharge.After the traveler has reached the point above which it is desired todischarge the load it strikes a stop with an elastic spring I) behindit, which prevents its being pulled any'farther in that direction.Afurther pull upon the rope C will, however, fold the lever-arm Ndownward alongside the casing F, so as to allow the upper end of thecasing to pass up through the ring a, and after the end of the lever haspassed through the ring the spring 0 will force it out into the positionshown in Fig. 2, where it is held by the latch M. It will be manifestthat when in this position it will not be possible for the casing F topass back through the ring a, as this lever-arm looks it in place. then,therefore, the tension upon the rope O is relieved, the traveler P willmove down the inclined rope Q, and the derrick-fork will be suspendedfrom the ring a by reason of the lever-arm N projecting above the ringand preventing the fork from dropping downward. lVhen the traveler hasreached the point above the stack and it is desired to allow the fork todescend upon the stack for another load, the rope K is pulled so thatthrough the rope J it acts upon the rod L and the latch M, pulling thelatter down until the point of the short arm of the lever N is released.This allows the lever N to turn up into the position shown in the dottedlines, and it and the upper end of .the casing are then free to descendthrough the ring a, when the fork may be againlowered upon the stack. Bythis arrangement I am enabled to move the loaded fork up the incline,discharge the load at the desired point, and retain the fork in itssuspension from the traveler until it is again moved down the incline tothe point where it is to be dropped upon the stack.

- Having thus described my invention, WhatI claim as new, and desire tosecure by Letters Patent, is

l. The traveler adapted to move upon an inclined guide-rope and havingapulley over which the hoisting-rope passes, a horizontal ring suspendedfrom the traveler, surrounding the vertical portion of thehoisting-rope, a casing of smaller diameter than the ring attached tothe rope and having the fork suspended from it, a lever fulcrumed in theeasing, with one end projecting outward therefrom, a spring-actuatedlatch engaging the other end, and an independent spring holding the endof the lever against the latch when the latter is in place and forcingthe outer arm of the lever into a vertical position when the latch isdisengaged, said spring also yielding to allow the outer arm of thelever to be moved downward when passing through the ring, substantiallyat herein described.

2. A derrick-fork with a suspending and hoisting rope and a trippingdevice, an in clined guide-rope and a traveler moving thereon, a pulleyconnected with the traveler, over which the hoisting-rope passes, astop-lever fulcrumed above the fork, alatch engaging the lever toprevent its moving in one direction, a cord by which the latch isdisengaged from the lever, a spring holding the lever against the latch,said spring yielding to allow the lever to turn down in the oppositedirection, and a ring through which the lever, is allowed to pass upwardby the yielding spring and above which it is held by the latch until thelatter is released, substantially as herein described.

In witness whereof I have hereunto set my hand.

JASPER S. SCOTT. Witnesses:

S. H. NOURSE, J. A. BAYLESS.

